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The alarm is on the feed reel so the movie projectionist can nap.
On really old projectors, you have an alarm on the hub of the feed reel.
At the end of a reel, the feed reel turns so fast the alarm will start ringing to warn you that a changeover is coming up.
As most of the movie rolls onto the take-up reel, the take-up reel turns slower and the feed reel has to turn faster.
The machine, which both fencers will be attached to by means of feed reels and body cords, determines within a twentieth of a second who hit whom first.
In the two-reel system the projector has two reels-one is the feed reel, which holds the part of the film that has not been shown, the other is the takeup reel, which winds the film that has been shown.
Long used for home movies before the video camera, this uses double sprocketed 16 mm film, which is run through the camera, exposing one side, then removed from the camera, the takeup and feed reels are switched, and the film run through a second time.
In a two-reel projector the feed reel has a slight drag to maintain tension on the film, while the takeup reel is constantly driven with a mechanism that has mechanical 'slip,' to allow the film to be wound under constant tension so the film is wound in a smooth manner.
In use, the supply reel or feed reel containing the tape is mounted on a spindle; the end of the tape is manually pulled out of the reel, threaded through mechanical guides and a tape head assembly, and attached by friction to the hub of a second, initially empty takeup reel.
Ribbon movement, which also occurs at every keypress, automatically reverses direction when there is no ribbon left on the feed reel; two mechanical sensors, situated next to each wheel, move when the ribbon is put under tension (indicating ribbon end), attaching the appropriate wheel to the ribbon transport mechanism and detaching the other.
On some projectors, the operator would be alerted to the time for a change by a bell that operated when the feed reel rotation exceeded a certain speed (the feed reel rotates faster as the film is exhausted), or based on the diameter of the remaining film (Premier Changeover Indicator Pat.
